从字符串中截取ip地址

String regexString="\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}";Pattern p = Pattern.compile(regexString);String parentString="abdk d2.2d9(,dsf ]t20,2.33.1.8yff";Matcher m = p.matcher(parentString);boolean result = m.find();while(result) {    System.out.println(m.group());result = m.find();}// 或者String parentString="ftp:\\t127.168.220.221\\yff";String regexString=".*(\\d{3}(\\.\\d{1,3}){3}).*";String IPString=parentString.replaceAll(regexString,"$1");System.out.print(IPString);